Process of making methylene digallate of bismuth oxyiodids.



UNITED STATES PATENT OFFICE.

SAMUEL LEWIS SUMMERS, OF PHILADELPHIA, PENNSYLVANIA. i

: PROCESS OF MAKING METHYLENE DlGALLATE F BISMUTH OXYIODIDS.

SPECIFICATION forming part of Letters Patent N 0. 690,673, dated January '7, 1902.

Application filed November 5, 1901- oxyiodid, a new chemical body invented or discovered by me and for which I applied for Letters Patent by application filed October 9, 1901, Serial No. 78,082. The said product of my process is the compound of bismuth oxyiodid and methylene digallic acid, and its chemical formula is Bi I O, H O which may be illustrated by the structural formula C ,,H(OH) BiOHl and it forms when completely purified by washing an amorphous light yellowish-brown powder, insoluble either in water or alcohol, containing about 39.33 per cent. of bismuth and about 24.1 per cent. of iodin.

I will now proceed to describe my present invention, which consists of a new, expeditious, and economical method or process for preparing this new product.

-Asolution is prepared of 95.4 grams of crystallized bismuth nitrate in from one hundred and twenty to one hundred and fifty cubic centimeters of glacial acetic acid. This solution is poured with constant stirring into a solution of 33.2 grains of potassium iodid and fifty grains of sodium acetate in two liters of water, in which last-mentioned solution 42.7 8 grains of methylene-digallic acid crystals are suspended. This latter solution is preferably heated on the water-bath to about centigrade before admixing with it the firstmentioned bismuth-nitrate solution. Aprecipitate forms at once on bringing these two solutions together. It is at first a yellowish precipitate, but changes rapidly to a reddishbrown color, which dies to a yellowish brown. This precipitate is then to be washed, first by decantation and finally upon a filter, until the washings run off colorless and free from dissolved salts.

It is to be observed that the sodium acetate used in the process plays no part except to Serial No. 81,259. (No specimens.)

: render the oxyiodid as first formed insoluble,

process above detailed by having the methyl-.

ene digallic acid present in suspension in one of the solutions the bismuth oxyiodid in the moment of its formation-namely, in statu.

nascendt-combines with the methylene di-' gallic acid to form the new salt. The reactions may be expressed in chemical notation i as follows:

and

is m m+ e z m ie isi Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- r 1. The process of producing the methylene digallate of bismuth oxyiodid, which consists in first preparing a solution of bismuth oxyiodid from bisiiiuth nitrate in the presence of glacial acetic acid as a solvent, then preparing a water solution of potassium iodid in the presence of. sodium acetate to render it primarily insoluble, and adding to such solution crystallized methylene digallic acid which is held in suspension therein; then admixing the solutions and purifying the precipitate formed, by washing and filtration.

2. The process of producing the methylene digallate of bismuth oxyiodid by reacting on bismuth oxyiodid in nascent state, by a solution of potassium iodid in which is suspended the crystals of methylene digallic acid; and then purifying the precipitate formed by the resulting reaction.

In testimony whereof I have hereunto affixed my signature this 1st day of November, A. D. 1901.

SAMUEL LEWIS SUMMERS.

Witnesses GEO. W. REED, H. E. BATTERSBY. 

